Bending machines



Dec. 20, 1955 Filed Oct. 13, 1954 J. U HRI N BENDING MACHINES 2 Sheets-Sheet l INVENTOR. JOH N UHRI N PARKER & CARTER ATTORNEYS J. UHRlN BENDING MACHINES Dec 20, 1955 2 Shee tsSheet 2 Filed Oct. 15, 1954 MEI INVENTOR. JOHN UHRI N PARKER 8. CARTER ATTORNEYS United t te fl BENDING MACHINES John Uhrin, Kenosha, Wis. Application October 13, 1954, Serial No. 461,953

2 Claims. (Cl. 153-15) My invention relates to bending machines and more particularly to slidably adjustable blocks incorporated into a machine for bending tubes, rods, bands, angle irons or the like.

An object of my invention is to provide adjustable members of varied contours, adaptable to bending machines having a stationary mounting and a swinging arm pivotally mounted thereon.

Another object of my invention is to slidably mount the adjustable members in a manner to permit minute adjustment of either the clamping block on the stationary mounting, or the roller mounting block on the pivotally mounted swinging arm.

In the construction of bending machines for forming various parts such as tubes, angle or channel irons, flat stock, or bar stock, it is customary to furnish clamping members, blocks and rollers of varied shapes or contours to be supported by the stationary member mounted on a surface plate, or by the swinging arm pivotally mounted on the stationary member, which swinging arm is employed to do the bending or forming operation.

The blocks, clamping members and roller supports are usually constructed in a manner to permit easy changing or replacing so that the proper member may be readily placed in position for the bending operation.

The devices illustrated, specified and claimed herein are constructed so that they may be easily removed or replaced, and when placed in position, may be slidably adjusted by means of threaded nuts. In this manner variations for clamping and forming may be accomplished without changing the members, thereby saving time and permittingmore accurate performance due to the minute slidable adjustment of the clamping member and roller.

The device is simple in construction and easy to manipulate without special tools or special mechanical knowledge, and is adaptable for use with various conventional bending machines now on the market.

Other and further objects of my invention will become more apparent as the description proceeds when taken in conjunction with the drawings, in which:

Figure 1 is a perspective view of a conventional bending machine, illustrating the manner in which the members constituting my invention may be mounted thereon.

Figure 2 is a fragmentary cross sectional view of the clamping block mounted onto the stationary member and slidably supported by means of a U bolt engaging an elongated aperture and supported by the apertures in the mounting.

Figure 3 is a detail view in part section, of a modified form of guide means for a clamping block employing two separate bolts as guides for the block.

Figure 4 is a longitudinal section of the stationary support and the pivotally mounted arm, illustrating the clamping block and roller mounting supported slidably in relation to the pivot pin.

Figure 5 shows a modified form of clamping block, illustrating the manner in which it may support a work piece in its relation to the pivot pin and the roller employed for bending the work piece, and

Figure 6 shows still another form of clamping member of a modified end counter.

Similar characters of reference indicate corresponding parts throughout the several views. Referring now to the same, the character 10 in Figure 1 shows a surface plate which is a part of the bending machine, and a stationary support assembly including a top member 11 and a bottom member 12 is mounted on supporting brackets 13 and 14 fastened to the surface plate by bolts 15 or the like. The top and bottom member 11 and 12 respectively as herein shown, consists of sheet metal bars spread vertically from one another at 16 and 17. A transversely disposed guide member 18, shown in part, is supported at the inner end of the stationary support assembly to form an adjustable stop for certain bending operations. The support assembly is suitably attached to the supporting brackets 13 and 14 by upright bolts or pins 19 and 20. A circular track 21 may also be provided as usual, having a slidable stop 22 thereon. This track is attached at 23 to the surface plate 10 and is shown raised upward therefrom, to support the swinging arm assembly, which will now be described.

A swinging arm assembly includes an upper member 23 and a lower member 24 spread apart from one an- 25 and 26 and with its outer end attached to an operating lever 27 at 28. This swinging arm assembly is pivotally mounted to the stationary support by means of a vertical pin 29, acting as the fulcrum around which a work piece 44 is bent. This pin may be of any desired shape or contour, or may be equipped with a sleeve of varied contour to fit the Work piece being bent. All of the features described above are parts of a conventional bending machine and are not a part of my invention, but are shown and described to show further the operative features of my invention.

The upper and lower members 11 and 12 of the stationary support, and the upper and lower members 23 and 24 of the swinging arm assembly, a plurality of matching apertures shown at 30, these apertures being spaced at an even distance apart in longitudinal alignment with one another.

The stationary support has a longitudinally sliding block 31 between upper and lower members 11 and 12, as shown in Figure 4, having an elongated slot 32 extending therethrough, and a longitudinal threaded member 33 attached to its inner. end. A vertical sleeve 35, encircling a verti- The revolving of the knurled nut 38 on the threaded member 32 will determine the forward or rearward adjustment of the block 31, guided by the members 40 and 41 of the U bolt in the slot 32 of the block. In Figure tion as the members 40 and 41 of the U bolt 39, for guiding the block 31 toward and away from the swivel are provided with v pin 29 in position to clamp the work piece 44 shown in dotted line, during the bending operation. These bolts, as well as the upright pin 36, can be selectively readjusted in other apertures 30, if necessary, to afford different ranges of slidable adjustment of the block 31.

A block 45 is longitudinally slidable between the upper and lower members 23 and 24 of the swing ng arm assembly, and is provided with a pin 46 at its forward end with a roller 47 rotatably encircling said pin 46 as shown in Figure 2. This roller is adapted to contact a work piece 44 engaging the fulcrum pin 29 when the block 45 is moved toward and away from the fulcrum pin 29. The block 45 is provided with an elongated slot 48 and a threaded member 49 engaged by a knurled nut 50, adapted to contact the face of the horizontal sleeve 51 forming part of the vertical sleeve 52, which is supported by the vertical pin or bolt 53 engaging opposed apertures 30, within the upper and lower members 23 and 24 of the swinging arm assembly in the same manner as has been described with respect to corresponding parts of the stationary support assembly. The block 45 is also guided longitudinally by a U bolt 39 or bolts 42 and 43 selectively adjustable in apertures 30 in the same manner described in connection with the clamping block 31.

From the above description it will be manifest that the working position of sliding blocks 31 and 45 may be minutely adjusted and maintained by means of the knurled nuts 38 and 50. In this manner work pieces 4-4 may be inserted and supported without requiring the removal of any bolts within the stationary mounting assembly and the swinging arm assembly. This obviously provides a convenience and function not heretofore revealed in the prior art.

In addition, however, a rough preliminary adjustment can be provided, if necessary, by shifting the U bolts 39 and pins 36 or 53 to different apertures 30.

Although I have shown a particular structure and arrangement of parts constituting my invention, I am aware that many changes may be made in the form, shape and configuration of the component parts without departing from the spirit of my invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent in the United States is:

l. A bending machine having a stationary and a swinging member pivotally attached to one another by means of a pivot pin, said stationary and swinging members each including a pair of spaced upper and lower bars having a series of vertically matching perforations therealong, a clamping block slidably supported by said stationary member between its bars, said clamping block having an elongated slot extending therethrough, a pair of guide pins engaging said slot and selectively supported at opposite ends in the perforations in the stationary mempin in different ranges of ber, for guiding said clamping block relative to said pivot adjustment along said stationary member, a roller support block slidably supported by said swinging member between its bars, said roller support block having an elongated slot extending therethrough, a pair of guide pins engaging said slot and selectively supported at opposite ends in the perforations in the swinging member for guiding said roller support in different ranges of adjustment along said swinging member, and means carried by each of said stationary and swinging members for slidably adjusting said blocks toward and away from said pivot pin for forming a work piece.

2. A bending machine having a stationary mounting consisting of a pair of horizontal members spaced apart from one another and attached to a surface plate, both of said members provided with vertically matching apcr turcs extending therethrough and in longitudinal alignment with one another, a swinging arm assembly pivotally attached to said stationary mounting, a vertical pivot pin extending through said stationary mounting and said swinging arm, said swinging arm consisting of a pair of horizontal members spaced apart from one another, both members provided with vertically matching apertures extending therethrough in longitudinal alignment with one another, a clamping block having an elongated slot extending therethrough, a pair of vertical guide pins selectively engageable at opposite ends with matching apertures in the horizontal members of said stationary mounting and extending through the elongated slot, a roller support block having an elongated slot extending therethrough, a pair of vertical guide pins selectively engageable at opposite ends with matching apertures in the horizontal members of said swinging arm assembly, and extending through the elongated slot of said block, a sleeve selectively mounted at opposite ends in matching apertures on each of said stationary mounting and swinging arms, each of said blocks having a horizontally disposed threaded rod attached thereto, said rods extending slidably through said sleeves, and threaded members engaging said rod and adapted to abut said sleeves for adjusting the working distance of said blocks relative to said pivot pln.

References Cited in the file of this patent UNITED STATES PATENTS 909,936 Rice Jan. 19, 1909 1,523,594 Hossfeld Jan. 20, 1925 2,414,387 ONeil Jan. 14, I947 FOREIGN PATENTS 383,620 Germany Oct. 15, 1923 1,047,922 France July 29, 1953 

